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 #include &quot;bookwindow.h&quot;
 #include &quot;bookdelegate.h&quot;
 #include &quot;initdb.h&quot;

 #include &lt;QtSql&gt;

 BookWindow::BookWindow()
 {
     ui.setupUi(this);

     if (!QSqlDatabase::drivers().contains(&quot;QSQLITE&quot;))
         QMessageBox::critical(this, &quot;Unable to load database&quot;, &quot;This demo needs the SQLITE driver&quot;);

     <span class="comment">//</span> initialize the database
     QSqlError err = initDb();
     if (err.type() != QSqlError::NoError) {
         showError(err);
         return;
     }

     <span class="comment">//</span> Create the data model
     model = new QSqlRelationalTableModel(ui.bookTable);
     model-&gt;setEditStrategy(QSqlTableModel::OnManualSubmit);
     model-&gt;setTable(&quot;books&quot;);

     <span class="comment">//</span> Remeber the indexes of the columns
     authorIdx = model-&gt;fieldIndex(&quot;author&quot;);
     genreIdx = model-&gt;fieldIndex(&quot;genre&quot;);

     <span class="comment">//</span> Set the relations to the other database tables
     model-&gt;setRelation(authorIdx, QSqlRelation(&quot;authors&quot;, &quot;id&quot;, &quot;name&quot;));
     model-&gt;setRelation(genreIdx, QSqlRelation(&quot;genres&quot;, &quot;id&quot;, &quot;name&quot;));

     <span class="comment">//</span> Set the localized header captions
     model-&gt;setHeaderData(authorIdx, Qt::Horizontal, tr(&quot;Author Name&quot;));
     model-&gt;setHeaderData(genreIdx, Qt::Horizontal, tr(&quot;Genre&quot;));
     model-&gt;setHeaderData(model-&gt;fieldIndex(&quot;title&quot;), Qt::Horizontal, tr(&quot;Title&quot;));
     model-&gt;setHeaderData(model-&gt;fieldIndex(&quot;year&quot;), Qt::Horizontal, tr(&quot;Year&quot;));
     model-&gt;setHeaderData(model-&gt;fieldIndex(&quot;rating&quot;), Qt::Horizontal, tr(&quot;Rating&quot;));

     <span class="comment">//</span> Populate the model
     if (!model-&gt;select()) {
         showError(model-&gt;lastError());
         return;
     }

     <span class="comment">//</span> Set the model and hide the ID column
     ui.bookTable-&gt;setModel(model);
     ui.bookTable-&gt;setItemDelegate(new BookDelegate(ui.bookTable));
     ui.bookTable-&gt;setColumnHidden(model-&gt;fieldIndex(&quot;id&quot;), true);
     ui.bookTable-&gt;setSelectionMode(QAbstractItemView::SingleSelection);

     <span class="comment">//</span> Initialize the Author combo box
     ui.authorEdit-&gt;setModel(model-&gt;relationModel(authorIdx));
     ui.authorEdit-&gt;setModelColumn(model-&gt;relationModel(authorIdx)-&gt;fieldIndex(&quot;name&quot;));

     ui.genreEdit-&gt;setModel(model-&gt;relationModel(genreIdx));
     ui.genreEdit-&gt;setModelColumn(model-&gt;relationModel(genreIdx)-&gt;fieldIndex(&quot;name&quot;));

     QDataWidgetMapper *mapper = new QDataWidgetMapper(this);
     mapper-&gt;setModel(model);
     mapper-&gt;setItemDelegate(new BookDelegate(this));
     mapper-&gt;addMapping(ui.titleEdit, model-&gt;fieldIndex(&quot;title&quot;));
     mapper-&gt;addMapping(ui.yearEdit, model-&gt;fieldIndex(&quot;year&quot;));
     mapper-&gt;addMapping(ui.authorEdit, authorIdx);
     mapper-&gt;addMapping(ui.genreEdit, genreIdx);
     mapper-&gt;addMapping(ui.ratingEdit, model-&gt;fieldIndex(&quot;rating&quot;));

     connect(ui.bookTable-&gt;selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
             mapper, SLOT(setCurrentModelIndex(QModelIndex)));

     ui.bookTable-&gt;setCurrentIndex(model-&gt;index(0, 0));
 }

 void BookWindow::showError(const QSqlError &amp;err)
 {
     QMessageBox::critical(this, &quot;Unable to initialize Database&quot;,
                 &quot;Error initializing database: &quot; + err.text());
 }</pre>
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